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Ultimate Ears UE Premier left and right units held in fingers.
Harley Maranan / SoundGuys

UE Pro PREMIER review

Ultimate Ears' pro division packs a ludicrous 21 drivers into each of these custom-molded IEMs, and the sound is a little surprising.
September 28, 2023
The bottom line
UE's top-of-the-line custom-fit IEMs feature an advanced acoustic design that delivers precision-crafted audio directly to your eardrums. If you're willing to go through the fitting process (which requires an audiologist visit), the cost, and the wait to get them, you'll be rewarded with a monitoring experience that fits like a glove but needs heavy external EQ tweaking to shine.

UE's top-of-the-line custom-fit IEMs feature an advanced acoustic design that delivers precision-crafted audio directly to your eardrums. If you're willing to go through the fitting process (which requires an audiologist visit), the cost, and the wait to get them, you'll be rewarded with a monitoring experience that fits like a glove but needs heavy external EQ tweaking to shine.



Case 85 x 75 x 45 mm


8.5g (each IEM)

Noise isolation
What we like
Custom, personalized fit
Excellent acoustic isolation
Very sensitive, can go loud if needed
What we don't like
Awful frequency response
Case design
Processing and delivery time
High price
SoundGuys Rating
User Rating
Rating Metric
Our Rating
User Rating
Sound Quality
Isolation / Attenuation
Durability / Build Quality

Ultimate Ears (UE) has a storied history going back almost 30 years, which began with the creation of the custom-fitted musician’s in-ear monitor (IEM) category in collaboration with legendary rock drummer Alex Van Halen. More recently, after its acquisition by Logitech in 2008, UE entered the broader audio consumer consciousness with its well-received line of powerful portable Bluetooth party speakers, such as the UE HYPERBOOM.

UE still caters to the needs of professional and semi-pro musicians needing IEM solutions for the stage and studio through its UE Pro division, with a range of products, including the UE 5 Pro and the UE 18+ PRO. The UE Pro PREMIER is the company’s top-of-the-line custom-molded IEM boasting a crazy 21 balanced armature drivers in each earpiece, costing $2999 at Manufacturer site a set. Let’s dig in to see what kind of experience and sound quality that gets you.

Editor’s note: this is the first version of the article. Updates will follow as the market changes.

About this UE Pro PREMIER review: We tested the UE Pro PREMIER over three weeks. The company provided the unit for this review.

These in-ear monitors are aimed squarely at professional and semi-pro musicians who want the very best in terms of fit and isolation for the stage and studio. Though anyone can get a set to listen to their tunes on the go, that would be overkill in many ways, and you’ll find that the sound is tailored in a different way than typical earbuds or headphones.

What’s it like to use the UE Pro PREMIER?

Ultimate Ears UE Premier top down with case
Harley Maranan / SoundGuys
You get a protective but not particularly portable storage case with the IEMs, along with a cleaning tool and cloth.

The user experience with the UE Pro PREMIER begins with a visit to the UE Pro product page. Here, you’ll make left and right color selections and decide on adding a cosmetic “Halo,” UE Switch swappable faceplates, and your choice of cable length and color. You can also add an ambient feature that adjusts how much environmental sound you want to hear (for a $50 up-charge). For our review sample, I selected “Royal Blue” translucent for the left and “Lucky Red” translucent for the right, with no “Halo” or ambient feature.

Then there’s the minor detail of going to an audiologist and getting your ear impressions made — UE Pro provides a handy page of instructions and requirements to take with you. Then, you mail the physical impressions to Southern California, which are digitally scanned and kept on file. At the time of ordering, there was a 25-business-day lead time for the product, which includes quality control checks of the custom-crafted earphones.

When my package arrived, taking the freshly made custom IEMs out of the basic black cardboard packaging and sliding them into my ears was a treat. It’s an unusual feeling to have something fit this well into your ears so effortlessly. The IEMs feel pretty large, but are reasonably lightweight at less than 9g a piece. And once they are nestled in your ears with a simple push, you quickly forget about them. The UE Pro PREMIER are extremely comfortable — critical for something intended to be worn for many hours. While the housing material feels just like hard plastic (there’s no foam or rubber between it and your ear), they seal well. They also feel secure, but are quick and easy to take out and put in again repeatedly.

Ultimate Ears UE Premier shown in package foam insert.
Harley Maranan / SoundGuys
The cables plug into each IEM using UE Pro’s IPX Connection System.

The SuperBAX cable attaches to each IEM with a tiny removable coaxial connector on the forward-facing edge. At this end of the cable, there’s an approximately 100mm long external cable sleeve (matched to the cable color) that gives the cable some rigidity where it loops over and behind your outer ear, keeping the cable out of the way, and guiding it toward the back of your neck. There, it can be cinched in place with the sliding Y-split joint that gives you control of where the left-right cable split occurs, securing the cable quite effectively at the back (or front) of your neck, making unintended pulls on the cable less traumatic to your ears.

I find that this cable is very prone to getting tangled with itself, and whenever I remove the IEMs and store them, they tend to end up in a knot. If UE included a cable management solution to prevent this, it would save a lot of time.

To assist sound guys on the road with bands using multiple sets of the UE Pro PREMIER, each product is individually engraved with initials to identify the owner. The 85 x 75 x 45mm Ultimate Ears square case can also be engraved with your name for no extra charge, which is a nice touch. It also has a cleaning tool attached to the inside of the lid, another thoughtful detail. While sturdy, I found the case to be unwieldy and annoying to open with its gasket-fitted, detachable lid. I repurposed a soft zippered case from a far less expensive set of earbuds for stowing the UE Pro PREMIER and carried it around during the review period.

How does the UE Pro PREMIER connect?

Ultimate Ears UE Premier jack plug held in fingers.
Harley Maranan / SoundGuys
It’s just a standard, familiar old 3.5mm right-angled TRS jack.

Our sample came fitted with the requested 1.27m (50″) long IPX Earloop Clear Cable, terminated in a standard, non-threaded right-angled 3.5mm gold plated TRS jack plug. No adaptor for 1/4″ output is included. You can opt for a longer 1.63m (64″) cable, and both lengths are available in black or clear. If you’re looking to use these with a balanced (differential) output, you’ll need to add the 50″ Balanced IPX Cable With Earloop to your shopping basket ($149).

The connector used to attach the cable to the IEMs isn’t a standard two-pin connector or the MMCX connector most people associate with this product category. Instead, they use a smaller coaxial connector called the IPX Connection System. According to UE Pro, MMCX was deemed to have poor reliability, so consequently, this new system was designed from the ground up. This cable and connector system is built specifically to withstand the rigors of touring musicians, minimizing the need for service and maintenance, and has been tested for over 3,000 connection cycles.

You won’t need any external amplification; any source with a headphone jack should be able to drive these IEMs with their low 15-ohm impedance (at 1kHz) and impressive 120 dB(SPL) per volt sensitivity (measured at the drum reference point, at 1kHz). These IEMs are so sensitive, in fact, that you need to be careful with the volume control. Most sources will provide enough power to produce dangerously high sound pressure levels in your ears.

UE Pro offers an impedance matching buffer jack to use with studio audio output devices, which is helpful in certain circumstances, depending on the age of the equipment it’s being interfaced with. The buffer jack will resolve impedance mismatches between the UE Pro PREMIER and your audio output device. The UE Pro PREMIER sensitivity is high without the buffer jack. If it’s too sensitive, meaning too loud, and you cannot adequately use your volume control’s full resolution, use the buffer jack to reduce sensitivity. UE tells us it has only seen the impedance mismatch issue with studio consoles.

No, there’s no microphone on the UE Pro PREMIER. However, adding one is possible by purchasing the UE Pro Aux Mic Cable ($100), which shares the proprietary IPX Connection System cable terminations.

How well do the UE Pro PREMIER block out noise?

Passive noise isolation is one the most significant benefits of getting a good fit with your headphones, and an individually custom molded earpiece should get you close to the theoretical ideal in that regard. Our measurements show that these do indeed offer some of the best passive acoustic isolation we’ve seen, in line with the musician’s hearing protection earplugs we’ve tested in our lab.

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In the low-frequency region below 1kHz, attenuation of external noise averages around 15dB, and above that rises to over 45dB around 3kHz. This provides excellent isolation from your surroundings, whether that’s a concert stage with live drums and roaring amplifier stacks or the sound of the subway on your ride home from work. This means you’ll have a decent signal-to-noise ratio even when monitoring at low levels.

How does the UE Pro PREMIER sound?

Before we dive into the actual sound, we need to break down the impressively complex acoustic integration these IEMs boast internally. It’s a highly unusual multiway design employing a five-way passive crossover to divide up the incoming signal between drivers that perform optimally with specific frequency ranges. Avoiding any comparisons with the blade count arms race in the shaving industry, both the left and right in-ear monitors are loaded with the following components, which are all based on balanced armature (BA) technology:

  • one True Tone Plus proprietary driver (delivers upper-register harmonics and overtones)
  • one quad-high super tweeter
  • one quad-mid driver
  • four dual diaphragm mid-low drivers
  • two dual sub-low drivers

There’s clearly a lot going on here, making me genuinely curious about what this added complexity could bring to the table, sonically speaking. With the IEMs placed firmly in my ears, my first listening test involved plugging the jack into my iPhone via an Apple DAC dongle. I loaded up my test playlist, closed my eyes, and pressed play.

Ultimate Ears UE Premier (both) showing transparent inside view.
Harley Maranan / SoundGuys
The clear molded IEM housings allow you to see the complex acoustic integration within.

Editor’s note: this review uses a hover-enabled glossary to describe sound quality based on a consensus vocabulary. You can read about it here.

Should you buy the UE Pro PREMIER?

Ultimate Ears UE Premier worn in ear profile
Harley Maranan / SoundGuys
Once they’re in, these custom IEMs will reliably stay in place.

If you’re in the market for custom-molded in-ear monitors, you might be drawn towards the UE Pro PREMIER. With its large driver count and high price, you might conclude that this is the best available product in this relatively niche category. However, based on my experience with them, I don’t consider that the case, due primarily to the odd tuning decisions made at UE that don’t benefit the listening experience or deliver the full capabilities of the hardware within.

Out of the box, the UE Pro PREMIER has notable sonic deficiencies, as outlined in the section above. However, if your source device has decent onboard equalization available (whether it’s analog or DSP), and you’re willing to spend some time fine-tuning the output to compensate, then you’ll be rewarded with excellent sound reproduction across the spectrum.

If you’d rather get something that has a better-optimized frequency response out of the box and doesn’t require significant tweaks, plenty of (non-custom) IEMs can do the job. It’s also worth noting that even though it was instrumental in developing the custom-molded IEM concept, UE isn’t the only game in town if you want to go the custom route.

Custom, personalized fit • Excellent acoustic isolation • Five-way crossover and Super Tweeter
MSRP: $2,999.00
UE's top-of-the-line custom-fit IEMs feature an advanced acoustic design that delivers precision-crafted audio directly to your eardrums. If you're willing to go through the fitting process (which requires an audiologist visit), the cost, and the wait to get them, you'll be rewarded with a monitoring experience that fits like a glove but needs heavy external EQ tweaking to shine.

What should you get instead of the UE Pro PREMIER?

The image shows the right Sennheiser IE 900 earbud resting on top of the greyish case with individual serial number, atop a wood desk.
The Sennheiser IE 900 employs a much simpler acoustic implementation and performs excellently.

Whether you’re looking for monitors for stage or studio use or casual listening, my first recommendation in this product category is the Shure SE215. This industry standard retails for $99 at Amazon. You can purchase them off-the-shelf with a good selection of ear tips, providing fantastic isolation making them a mainstay in pro-audio circles.

If you want a better-tuned frequency response for critical music listening, then either the Sennheiser IE 900 for $1199 at Amazon or their more affordable sibling, the IE 600 for $599 at Amazon are great options. These both aptly demonstrate that sometimes simpler is better, as both use a single full-range driver to achieve better results than the UE Pro PREMIER does with its 21 drivers.

When it comes to custom-fit alternatives to the UE Pro PREMIER, UE Pro has other options but isn’t the only game in town. One inexpensive example that’s recently come to our attention is the ADV Model 3 Custom, an affordable IEM product $199.99 at Manufacturer site that works well and can be converted into musician’s earplugs quickly and easily, making it an incredibly flexible and cost-effective option.

Frequently asked questions

There are no controls on the cable or the IEMs themselves. Everything must be controlled using your source device.

Although UE Pro refers to its waterproof connection system, The PREMIER IEMs are not waterproof.